Working Paper No. 601

Social Networks and Crime Decisions: The Role of Social Structure in Facilitating Delinquent Behavior

Publicerad: October 21, 2003Antal sidor: 19Nyckelord: Strategic Interactions; Multiple Equilibria; Pairwise-Stable NetworksJEL-koder: C72; K42; Z13

Social Networks and Crime Decisions: The Role of Social Structure in Facilitating Delinquent Behavior Antoni Calvó-Armengol and Yves Zenou

We develop a model in which delinquents compete with each other in criminal activities but may benefit from being friends with other criminals by learning and acquiring proper know-how on the crime business. By taking the social network connecting agents as given, we study the subgame perfect Nash equilibrium of this game in which individuals decide first to work or to become a criminal and then the crime effort provided if criminals. We show that this game always has a pure strategy subgame perfect Nash equilibrium that we characterize. Ex ante identical individuals connected through a network can end up with very different equilibrium outcomes: either employed, or isolated criminal or criminals in network. We also show that multiple equilibria with different number of active criminals and levels of involvement in rime activities may coexist and are only driven by the geometry of the pattern of links connecting criminals. Using the equilibrium concept of pairwise-stable networks, we then show that the multiplicity of equilibrium outcomes holds even when we allow for endogenous network formation.



Historien om skolans uppgång, fall och möjliga upprättelse


Den här boken, författad av Gabriel Heller Sahlgren och Nima Sanadaji, spårar rötterna till den svenska skolans problem via en djupdykning i forskning och modern historia. På 1800-talet slog den progressiva utbildningsfilosofin igenom, med fokus på glädje, elevdemokrati och elevledd undervisning. Problemet var bara att den nya pedagogiken inte fungerade som det var tänkt. Forskningen tyder inte på att elever lär sig mer när de har roligt.

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